There's yet more evidence now that politicians of all political persuasions sometimes forget that microphones are likely going to be turned "on" when they're around. The Associated Press writes that after yesterday's Democratic candidates forum at the NAACP convention ended:

Fox News microphones picked up (Sen. Hillary Rodham) Clinton and (former senator John) Edwards discussing their desire to limit future joint appearances to exclude some rivals lower in the crowded field. "We should try to have a more serious and a smaller group," Edwards said.

Clinton agreed. "We've got to cut the number. ... They're not serious," she said, then thanked (Sen. Barack) Obama and Ohio Rep. Dennis Kucinich as they walked by. Turning back to Edwards, she added that she thought their campaigns had already tried to limit the debates and "we've gotta get back to it."Kucinich, one of the candidates that Clinton and Edwards may have been discussing, isn't taking kindly to such talk: "Imperial candidates are as repugnant to the American people and to our democracy as an imperial president," he says.

Our friends at ABC News' Political Radar say they're pressing the Clinton and Edwards campaigns to find out more about what the candidates said. ABC also has video and audio of the Clinton-Edwards conversation. The moment when Kucinich walks by comes about 31 seconds into it.

President Bush, you'll recall, has also been a little too candid around live mics in the past -- including last summer when he let slip the "s-word."